Real Housewives of Beverly Hills: Who's Causing the Drama?

Kyle Richards and Camille Grammer's Sin City spat followed the women all the way to New York City, where Camille had invited her costars to attend the opening of Kelsey Grammer's musical, La Cage Aux Folles, on Thursday's The Real Housewives of Beverly Hills.

Not only that, but the women – who'd been fighting over whether or not Kyle called Camille "insecure" and said no one would be interested in her without her famous husband – pulled their costars Kim Richards and Taylor Armstrong into the fray.

In another chapter in their sibling rivalry, Kyle accused her sister Kim of not defending her in the argument with Camille. But Kim said she wanted to stay out of the drama and not take sides. Then Kim reminded the group that Taylor had called Camille insecure at the airport.

"You're barking up the wrong tree," Taylor said. "I'm about to take you out back and get all Oklahoma on your ass."

Kyle, who called Camille a "liar" during dinner, fretted over whether or not to attend the premiere the following day. Lisa VanderPump, the only voice of reason during the trip, convinced Kyle to attend the event (the frilly white dress Kyle picked out didn't hurt, either). But the drama didn't end there. The awkward moments and catty confessionals continued throughout the episode, with Camille and Kyle deciding they'd rather cut ties than reconcile.